/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.rocketmq.example.transaction;

import org.apache.rocketmq.client.producer.LocalTransactionState;
import org.apache.rocketmq.client.producer.TransactionListener;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.common.message.MessageExt;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;

public class TransactionListenerImpl implements TransactionListener {
    private AtomicInteger transactionIndex = new AtomicInteger(0);

    private ConcurrentHashMap<String, Integer> localTrans = new ConcurrentHashMap<>();

    @Override
    public LocalTransactionState executeLocalTransaction(Message msg, Object arg) {
        /**
         * 这个方法代码逻辑是执行操作db逻辑，操作db完成建议返回 LocalTransactionState.UNKNOW  事务状态，因为mq会来回调检查本地是否是成功，这样可以确保事务的一致性
         *
         * LocalTransactionState.UNKNOW 返回这个事务
         */

        int value = transactionIndex.getAndIncrement();
        int status = value % 3;
        // 设置本地事务状态
        localTrans.put(msg.getTransactionId(), status);

        return LocalTransactionState.COMMIT_MESSAGE;
    }

    @Override
    public LocalTransactionState checkLocalTransaction(MessageExt msg) {

        System.out.println("检查事务消息" + msg);
//        // 校验本地事务状态
//        Integer status = localTrans.get(msg.getTransactionId());
//        if (null != status) {
//            switch (status) {
//                case 0:
//                    return LocalTransactionState.UNKNOW;
//                case 1:
//                    return LocalTransactionState.COMMIT_MESSAGE;
//                case 2:
//                    return LocalTransactionState.ROLLBACK_MESSAGE;
//                default:
//                    return LocalTransactionState.COMMIT_MESSAGE;
//            }
//        }
//        System.out.println("status = " + status);
        return LocalTransactionState.COMMIT_MESSAGE;
    }
}
